Restructuring Charges (Schedule Of Accrued Restructuring) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 1,283
Restructuring charges	1,511
Cash Payment	(1,849)
Foreign Exchange Adjustments	1
Ending Balance	946
2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	859
Cash Payment	(805)
Foreign Exchange Adjustments	0
Ending Balance	54
2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	1,283
Restructuring charges	652
Cash Payment	(1,044)
Foreign Exchange Adjustments	1
Ending Balance	892
Severance [Member] | 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	754
Cash Payment	(700)
Foreign Exchange Adjustments	0
Ending Balance	54
Severance [Member] | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	738
Restructuring charges	51
Cash Payment	(515)
Foreign Exchange Adjustments	0
Ending Balance	274
Lease Facility Costs [Member] | 2017 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	105
Cash Payment	(105)
Foreign Exchange Adjustments	0
Ending Balance	0
Other Exit Costs | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	545
Restructuring charges	601
Cash Payment	(529)
Foreign Exchange Adjustments	1
Ending Balance	$ 618